Eaton 93PM - Control Signals Overview

Figure 28. Principle of paralleled UPS systems
A Bypass inputs to UPSs 1 UPS 1 7 Battery
B Outputs from UPSs 2 UPS 2 8 Battery
C Load 3 UPS 3 9 MOB1
4 UPS 4 10 MOB2
5 Battery 11 MOB3
6 Battery 12 MOB4
The required parallel system wiring length must be equal to ensure
approximately equal current sharing when in the bypass mode.
For proper operation, the following must be true: 1A+1B=2A+2B=3A+3B=4A
+4B.
Any differences in wire length result in decreased capacity and improper
operation of the UPS system while in the bypass mode.
5.7.2 Control signals overview
Two controls signals (External CAN Network, Bypass Pull-Chain) are required
for external paralleling. Both of these control signals are fault-tolerant and
alarmed when disconnected.
External CAN (ECAN)
Eaton 93PM UPS 30–200 kVA
User's and installation guide
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Eaton Corporation plc 2017. All rights reserved. Revision: 005 Document ID: P-164000249 75 (126)